fix: Add build script and fix manifest

- Add build-apk.sh for easy compilation
- Simplify AndroidManifest.xml
- Fix themes.xml to use basic Android themes
- Enable BuildConfig
- Add okhttp-dnsoverhttps dependency

android-sdk/platforms/android-34/data/res/layout/slice_message.xml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2017 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<android.app.slice.widget.MessageView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:paddingTop="12dp"
+    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
+    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
+    android:background="?android:attr/activatedBackgroundIndicator"
+    android:clipToPadding="false">
+
+    <LinearLayout
+        android:id="@android:id/icon_frame"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="-4dp"
+        android:gravity="start|center_vertical"
+        android:orientation="horizontal"
+        android:paddingEnd="12dp"
+        android:paddingTop="4dp"
+        android:paddingBottom="4dp">
+        <!-- TODO: Support text source -->
+        <ImageView
+            android:id="@android:id/icon"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:maxWidth="48dp"
+            android:maxHeight="48dp" />
+    </LinearLayout>
+
+    <TextView android:id="@android:id/summary"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignStart="@android:id/title"
+        android:textAppearance="?android:attr/textAppearanceListItem"
+        android:maxLines="10" />
+</android.app.slice.widget.MessageView>